What converter do you have (Just want to know)
Converters come in two or 3 flavors
One is a "Stand alone" box, not part of a larger assembly.> Replace with Progressive Dynamics 92xx where the xx is as close as you can get to the last two digits of your current converter in most cases (The max current rating in all cases)
Converters that are part of teh power distribution center.. In this case you use the 46xx and replace just the converter part. Same on the last two digits
The third type of converter is also part of an inverter.. Now I'd go with the 9200 and just disable the converter module, way cheaper than a new inverter/charger.
Finally: NOTE: if you have a couple shorted cells in your battery, they can draw down the voltages... So check the batteries as well. MARINE/deep cycle do not always recover from 10x volts.